Darkover: First Contact (contains Darkover Landfall and Two to Conquer)

The Forbidden Circle (contains The Spell Sword and The Forbidden Tower)

Heritage and Exile (contains The Heritage of Hastur and Sharra's Exile)

The Saga of the Renunciates (contains The Shattered Chain, Thendara House, and City of Sorcery)

To Save a World (contains The World Wreckers and The Planetsavers)

A World Divided (contains Star of Danger, The Bloody Sun, and The Winds of Darkover)

Darkover anthologies:

The Keeper's Price

Sword of Chaos

Free Amazons of Darkover

The Other Side of the Mirror

Red Sun of Darkover

Four Moons of Darkover

Domains of Darkover

Renunciates of Darkover

Leroni of Darkover

Towers of Darkover

Marion Zimmer Bradley's Darkover

Snows of Darkover

Burroughs, Edgar Rice: Barsoom (Mars) series

A Princess of Mars

The Gods of Mars

Warlord of Mars

Thuvia, Maid of Mars

The Chessmen of Mars

The Master Mind of Mars

A Fighting Man of Mars

Synthetic Men of Mars

Swords of Mars

Llana of Gathol

John Carter of Mars

McCaffrey, Anne: Dragonriders of Pern series (in order of publication, as recommended by the author)

Dragonflight

Dragonquest

The White Dragon

Dragonsong (Harper Hall Trilogy #1)

Dragonsinger (Harper Hall Trilogy #2)

Dragondrums (Harper Hall Trilogy #3)

Moreta: Dragonlady of Pern

Nerilka's Story

Dragonsdawn

The Renegades of Pern

All the Weyrs of Pern

The Chronicles of Pern: First Fall

The Dolphins of Pern

Dragonseye

The Masterharper of Pern

The Skies of Pern

A Gift of Dragons

Dragon's Kin (with Todd McCaffrey)

Dragonsblood (by Todd McCaffrey)

Dragon's Fire (with Todd McCaffrey)

Dragon Harper (with Todd McCaffrey)

Dragonheart (by Todd McCaffrey)

Dragongirl (by Todd McCaffrey)

Dragon's Time (with Todd McCaffrey)
A short story titled "The Girl Who Heard Dragons" appears in The Girl Who Heard Dragons by Anne McCaffrey and A Gift of Dragons
A novelette titled "Runner of Pern" appears in Legends: Short Novels by the Masters of Modern Fantasy (edited by Robert Silverberg) and A Gift of Dragons
A story titled "Beyond Between" appears in Legends II (edited by Robert Silverberg)

Norton, ANdre: Witch World series Estcarp Cycle:

Witch World

Web of the Witch World

Three Against the Witch World

Warlock of the Witch World

Sorceress of the Witch World

Trey of Swords

'Ware Hawk

Gate of the CatHigh Halleck Cycle:

Horn Crown

Year of the Unicorn

Spell of the Witch World

Jargoon Pard

Zarsthor's Bane

The Crystal Gryphon (Gryphon Saga #1)

Gryphon in Glory (Gryphon Saga #2)

Gryphon's Eyrie (Gryphon Saga #3) (with A.C. Crispin)

Songsmith (with A.C. Crispin) The Turning:

The Turning I: Storms of Victory

The Turning II: Flight of Vengeance

The Turning III: On Wings of Magic

The Key of the Keplian (with Lyn McConchie)

Ciara's Song (with Lyn McConchie)

The Magestone (with Mary Schaub)

The Warding of Witch WorldShort Stories:

Lore of the Witch World

Four From the Witch World

Tales of the Witch World 1

Tales of the Witch World 2

Tales of the Witch World 3

Omnibus Volumes:

The Gates to Witch World (contains The Witch World, Web of the Witch World, and Year of the Unicorn)

Lost Lands of Witch World (contains Three Against the Witch World, Warlock of the Witch World, & Soreceress of the Witch World)